Portable hoisting machine



Nov. 25, 1930. A. H. WILSON PORTABLE HOISTING MACHINE Filed Nov. 18, 1927 2 Sheets$heet 1 Nov. 25, 1930.

A. H. WILSON PORTABLE HOISTING MACHINE Filed Nov 18, 1927 2 Sheets-Sheet 2 Patented Nov. 25, 193

UNITED STATES f, ALEXANDER n. WILSON, OF OAK PARK, rLnmors nssrsnon rovrHoMAs ELEVATOR:

COMPANY, OF CHICAGO, ILLINOIS, A; OORPOBTION:.OE ILLTNOIS 1 PORTABLE, norsrine, mamas 1 Application filed November 18, 1927. seriar sea-54,1 9. V

r This invention relates to hoisting machines, having reference moreparticularly to hoists of a portable character that are adaptx ed to be readilyntransferred as a unit from none field of operation to another.

One object of the invention is to provide power hoist of the type specified having a very simple and rugged structure and organization combining a high degree of rigid i0 ity and stability with a minimum'of weight so that it can readily be drawn by man power, if desired, from placefto place. An-

other object, is to provide a construction wherein the weight of the operating parts 15 shall be substantially uniformly distributed on the carrying platform or truck, so as to afford a Well balanced portable unit. A fur.-

ther object is to provide" an organization wherein the power transmission from the 2% motor to the cable-winding drum shall be 1 located at a low and substantially central g point on the carrying platform, thereby reducing to the minimum lateral vibration or side shake when the hoist is in operation.

Still other objects and attendant advan tages of the invention will be apparent to persons skilled in the art as the same becomes better understood by reference to the follow- -ing detailed description, taken in connection with the accompanying drawings showing a practical embodiment of the invention, in which,

Fig. 1 is a side elevation of the complete apparatus, partly broken out;

Fig. 2 is a front elevation, also partly broken out. a a

By reference to the drawings, it will be i l seen that theoperating parts of the hoist are mounted on a low truck consisting of a skeleton steel platform, and front and rear pairs of. supporting wheels. In the very simple structure illustrated, the platform com prises a pair ofchannel side beam-s orsills 1O rigidly spaced and connected at front and center by cross-bars 11 and 12. The rear portions of the side beams are spaced and con- 7 nected by a block 13 that supports themotor hereinafter referred to. To the under sides of the side beams 10 are attached frontand rear pairs of journals 14 and 15 for front andrear axles 16 and 17 on the projecting,

orrollers 18and 19. Mounted on, and conveniently cast inteends of which axles are -journald the wheels gral with thecross bar's 11 and'12 are a pair of A-frames 20 and21, in andbetweenthe upperends of which is jou-rnaled a drum shaft 22 Looseonshaft 22 isa winding:

drum or. reel '23 formed at 'one end thereof with an enlarged head 24 :thatreceives a brake band 25. The outer face of the head.

24 is alsofformed with a conical depression forming afemale clutchmember 26;

Keyed on the drum, shaft 22fadjacent to the head 24 of the drum is a large spur gear 27 having on thesidethereof 'adjacentto the drum a conical male clutch member 28. Loose on the drumshaft 22 opposite the forward end of the drum is-a sleeve 29 formedon its forward end with a cam 30 thatcooperates with either of a pairofcams-31formed on a ring32 attached to the inner sideof the upper end of the frame 20. The sleeve29 has a lateral hollow b'oss33 in which is secured acam operating handle34. The sleeve 29 abuts at its" rear end against the forward end of the drum, and by turning the handle 34 in either direction 90 degrees from the position shown the drum is forcedendwise andthe clutch members 26 and 28 are engaged, so thatthe drum is rotated by the gear 27.

Mounted on and rigidly attached ,to block13 is a motor35, hereinshown as an aircooled internal'combustion engine, with the structural details of whichthexpresent inventionvis not concerned. The motor'shaft 36 of the engine is drivingly connectedpreferably by a silent chain 37and cooperating sprocket wheelswith a transmission shaft 138 journaled in bearings 39formed on the platform cross-bars 11'and12. Keyed on the shaft 38 is a spur pinion meshing with and: driving the large'gear 27; r

the;

'Journaled; in and between thesidesills 10: a

side of the other side sill 10. On a projecting end of the rock-shaft 41 is an arm 47, to which is rigidly attached, as by bolts 48, a lever 49 that terminates at its forward end in a pedal 50. On the rear arm of the lever is adjustably secured a weight 51 that normally maintains the pedal lever in the raised position shown in Fig. 1, wherein the brake band is slacked. hen the lever 49 is depressed, its forward end snaps beneath a spring catch 52 that is mounted on the outer side of the adjacent sill, said catch serving to hold the depressed lever in a position wherein the brake band is applied to the head .of the drum. When the brake band is to be released, as the drum clutch is thrown in the lever catch is kicked back, freeing the lever arm, and the counterweight 51 instantly restores the lever to its raised position.

Pivotally mounted in the forward ends of the side sills 10 is a bail-shaped draft pole 53 by which the machine can be readily hauled to and from its place of operation. When not in use, the pole can be swung upwardly to overlie the forwardly bent upper end of the cam-actuating handle 34:.

From the foregoing it will be observed that the drum, the motor, and the transmission mechanism from the motor to the drum are so disposed as to distribute the weight of the parts substantially uniformly from end to end and side to side of the supporting frame, with the axes of the motor and drum shafts disposed in the vertical median longitudinal plane of the truck, whereby any sidewise tipping tendency is eliminated. Furthermore, by locating the transmission shaft through which the drive is transmitted from the motor to the drum at a low point (substantially in the horizontal plane of the truck platform), the transmission thrusts are mostly in a vertical direction and at low points, thereby contributing to the stability of the machine when at work.

I claim In a portable hoisting machine, the combination of a platform mounted on wheels, a pair of spaced frames mounted on and crosswise of said platform, a drum shaft ournaled in and between said frames in the median vertical longitudinal plane of said platform, a gear keyed to said drum shaft, a hoisting drum loose on said shaft, a motor mounted on said platform in rear of said frames with its shaft axially alined with said drum shaft, a transmission shaft journaled in said platform beneath said drum, a drive from said motor shaft to said transmission shaft, a pinion on said transmission shaft meshing with said gear, cooperating male and female clutch members on said gear and drum respectively, and manually operable means for engaging said clutch members.

ALEXANDER H. lVILSON. 

